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with R134A Cooling System (Figure 6-12) .................................. 6-30
TEMP CONT Indicator ................................................................... 6-31
CABINTEMP indicator .................................................................. 6-31
Temperature Control Schematic (Figure 6-13) ............................. 6-32
R12 Freon Cooling System (Aircraft without Forward
Evaporator and Blower Unit) ................... .......................................... 6-33
R12 Freon Cooling System-Standard Evaporator
(Figure 6-14) .. .................................................................................... 6-33
Learjet 31A
Pilot's Manual
TABLE OF CONTENTS (Cont)
COOL-OFF Switch ........ ...................................................................6-34
CABINFANSwitch .........................................................................6-34
Cabin Blower Diverter Control ........................................... ...........6-34
CREW FANSwitch .......................................... ................................6-34
R12 Freon Cooling System (Aircraft with Forward
Evaporator and Blower Unit) ......................................................... ...6-35
COOL-OFF Switch ........................................................................ ...6-35
CABIN FANSwitch .........................................................................6-35
Cabin Blower Diverter Control ........................................... ........ ...6-36
R12 Freon Cooling System-Optional Forward
Evaporator (Figure 6-15).............................................................6-36
CREW FANSwitch ..........................................................................6-37
R134A Cooling System ........................................................................6-37
COOL-OFF Switch ...........................................................................6-38
GASPER FAN....................................................................................6-38
FLOOD FAN Control.......................................................................6-39
CREW FANControl.........................................................................6-39
R134ACooling System (Figure 6-16) .............................................6-39
Auxiliary Heating System ..................................................................6-40
Crew Heater ......................................................................................6-40
Cabin Heater .....................................................................................6-41
AUX HT Switch ................................................................................6-42
Learjet 31A
Pilot's Manual
ANTI-ICE SYSTEMS
SECDON V#
ANTI-ICE &
ENVIRONMENTAL
Aircraft anti-ice protection is provided through the use of electrically
heated anti-ice systems, engine bleed air heated anti-ice systems, and
an alcohol anti-ice system. Electrically heated systems include the pitot-
static probes, total air temperature probe, engine inlet air temperature
and pressure sensors, stall warning vanes, and horizontal stabilizer
leading edge. Electrically heated windshields provide
windshield defogging. Engine bleed air is utilized to heat the wing
leading edge, windshield, and nacelle inlets. The alcohol system is installed
to provide anti-icing for the nose radome and backup anti-ice
protection for the pilot's windshield in event of normal anti-icing system
malfunction.
ICE DETECT LIGHTS
Two ice detect lights are installed on the forward glareshield to indicate
ice or moisture formation on the windshield during night operations.
These lights are illuminated whenever the BATTERY switches
are On. When particles of ice or moisture form, light refraction results
in the appearance of two red areas, approximately 14/2 inches (38
mm) in diameter, on the windshield. The light on the pilot's side is located
in a position covered by the windshield anti-ice airstream. The
copilot's light is positioned outside the antiice airstream; therefore,
the copilot's windshield must be monitored whenever windshield
anti-ice system is in operation. The red areas indicate ice encounters
when the OAT is below freezing and moisture encounters when the
OAT is above freezing. The lights are supplied 28 VDC through the tampL
and RICEDETcircuit breakers on the pilot's and copilot's circuit
breaker panels respectively.
PM-121
6-1
Original
Pilot's Manual
Leazjet 31A
WING INSPECTION LIGHT
The wing inspection light, located on the right forward fuselage, may
be used to visually inspect the right wing leading edge for ice accumulation
　
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